What a simple and clever way to adjust a turntable's RPM. All you need is this turntable platter and a light source, for example, from a desk lamp. The platter supports 33-1/3, 45, and 78 RPMs. The strobe pattern on the platter is based on the 60Hz AC power in the US. The platter supports US 60Hz power and European 50Hz AC power. The only issue is that the light source needs to be an incandescent light bulb. LED and CFL or fluorescent bulbs won't work. Nowadays, you can only find LED bulbs. I wound up using an appliance incandescent bulb, like one that is inside an oven or microwave.

This is wonderfully designed and something I should have bought a long time ago. Probably too early to truly tell but my albums appear to lay flatter and play much smoother. The only downside is that the title and product description say this is double sided with a Cartridge Alignment Protractor on the other side. I can say that like many other buyers of this product this is a complete fallacy. It would be wonderful for either Amazon or Hudson Hifi to remedy/correct this. That being said having the strobe is awesome and this is still very much recommended.

Easy to use. A great addition to to check turntable speed.

In the video it shows a dual sided disc. There are two products. One with dual side markings and one with one sided markings. They both seem to cost the same. I found out when I got mine with just one side and carefully looking at the description and other products available. So it was my fault. This is probably why people return them. In reality I don't need the second side. The main side to check for speed is fine. A little off printed so the lines are wobbly but it does not affect how this works. Definitely nice to have to check and adjust speed once in a while.

Ok

Disco molto utile per la regolazione della velocità. Nonostante avessi letto dei commenti negativi... nel mio caso il prodotto è arrivato perfetto. La stampa dei tratteggiati nel mio caso è perfetta come dimostrato in foto allegate. Il disco è in plexiglass bianco e di buon spessore. Arriva nella sua custodia come se fosse un disco LP.Adatto per la regolazione dei giri 33 - 45 - 78. Adatto per frequenze rete elettrica 50 Hz e 60 Hz. Ovviamente per la lettura ( lo dico ai meno esperti ) serve una luce pulsante a 50 o 60 Hz. Quindi non pensate di vedere qualcosa sotto la lampada LED ecc.Conclusione, ottimo prodotto ad un prezzo davvero competitivo.

Perfect tool for checking your speed

Se me ocurrió rescatar un tocadiscos de principios de los 90 y al limpiarlo, rompí la alfombrilla. Como no sabía si era mejor que fuese de silicona o rígida, me decidí por esta y me gusta bastante. Diría que “viste” el tocadiscos mientras está apagado y cumple la función a la perfección.

Works as described to do. Great stroboscope tool for checking if turntable speeds are running the way they should. 33, 45, 78 rpm’s on 1 side. Stylus alignment on the other side. Stores away nicely with your record collection. Good quality, just wish the print markings wasn’t raised on these, I was hoping for the print markings to be flush smooth or flat with the plastic plate so it could be used to check anti-skate functions. Maybe if you place a stylus protective cover on your cartridge it would work, but I loose or toss those little plastic things out over time. Would’ve been absolutely perfect if they printed markings totally smooth and flush instead of raised markings, which might or result to a damaged stylus needle tip if used for anti-skate purposes. Other than that, it’s still a great high quality item to have in your arsenal when needed.

I've made do with paper copies for years, but this pro tool is SO much better. first suggestion: before getting into it I HIGHLY SUGGEST anyone not familiar with this routine watch some YT videos first to help familiarize yourself with the ins and outs as it can be tedious and frustrating, so no meth before hand kiddies-lol. The disc is well made of thick material and it should last virtually forever unless you scrape the markings off, the disc comes packed in a cardboard jacket and its protected inside by a very soft record sleeve to protect the markings from damage. On one side of the disc you get strobe markings for three speeds 33-1/3, 45 and 78 as well as a cartridge protractor on the opposite side to properly set up your cartridge and stylus. Good value for the money as this disc gives two tools in one and helps you DO IT RIGHT to avoid bad sound and damage to your $$$ vinyl & stylus in the event of an incorrect setup. So far ive tested and corrected the speeds on three turntables using this Hudson disc and I didnt have to pay a technician $50 or more an hour to do any of it so its already paid for itself many times over in two days. Dont let anyone tell you it only works with a strobe light, this tool and others like it were designed decades ago to work with 60HZ incandescent house lighting and it worked fine for me that way. A brighter light say 60 - 75 watt or so is best but I tried a small lamp with a 40 watt bulb and it was still readable enough to use with no problems. TIPS FOR NEWBIES: -- watch some videos on YouTube to learn the routine and if youre lucky you'll find a video on your own model table or one very similar, the routine and adjustment locations vary a bit from table to table especially the more complex quartz locked types but most are basically the same with some variables in location and if you have a quarts or speed lock type table theres often a bit more involved setup routine for those, for example my old Harman Kardon had an extra third setting for the quartz lock button it had. If you feel uncomfortable going inside a turntable at first the video approach can be a big help. SOME tables are adjusted right on the motor using a tiny screw driver - in the motor housing are often two rubber covered holes, the rubber is a dust cover of sorts, you must feel your way through the rubber and gently feel for the screw (be careful) magnification can help here, most motor screws are slotted types but they could be phillips - theres usually have some kind of markings stamped or stickered on the motor with either the actual speeds or maybe an "L" and an "H" --- "L" is for low speed-(33-1/3 rpm) and "H" is for high speed-(45 rpm) and possibly 78. Other mostly newer or more complex tables have small tuning potentiometers/adjusters on a circuit board with the speeds marked that require a very small screwdriver - my HK settings were on a small pc board in front that also held the front panel controls, but they could be elsewhere on different makes -- they may even be marked with the actual speeds or they may not, in these cases finding a tech/repair manual online to download for your make and model of turntable is a huge help in identifying the adjusting pots and learning any specifics required to make the adjustments, if not MAKE SURE its the speed adjustments youre working with or you could mess up an unrelated setting and create new problems. If its certain youre on the speed adjusters but you dont understand the markings you can try watching the proper markings on the strobe disc and tweaking the screws a TINY amount until you see which speed is affected, be advised you only need to move the adjusters a VERY SMALL AMOUNT to see big speed changes, do not go beyond the range of the adjusters or you can easily destroy them as they are fragile. Dont be surprised if you have to go back and forth a few times to get it right, first these adjusters are very small and very touchy, plus many turntables can be decades old and the adjusters may be oxidized & hard to adjust - in this case moving them back and forth a bit to clean the internal wipers will often get you better resuults, in rare cases if theyre REALLY bad they may require a small dose of specialty electronics control cleaner such as DeOxit #5 electronics cleaner and lubricant to bring back their smoothness responsiveness, disconnect the power while doing this and let the pots dry before proceeding. Some turntables have access holes marked with the speeds in the bottom panel and you dont need to take off the bottom cover, others will require removing the bottom panel and setting the turntable up about a foot maybe less on boxes or books left and right then set a mirror underneath so you can look down and see the controls that way but watch where you stick your hands you could electrocute yourself if you poke around in the wrong place -- but this way you can sit comfortably in a chair for stability and tweak the settings while watching the strobe disc, if the table allows it to be done this way its by far the easiest way to do it and gets the job done in a much shorter amount of time. I had one nightmare table that required me to take it apart, tweak the screws, put it all back together and read the disc - and I had to repeat this several times before I was satisfied with the results and to say it was tedious is an understatement-lol.-- Anyway, im very pleased with this strobe disc and as you can see im speaking from first hand experience not just a quick look. Again, if the tables adjustments arent clearly marked or youre not sure of anything find a service manual or appropriate video unless youre certain of where you are and what youre doing inside the table, it may save you a world of aggravation.

OK Hudson, I've been happy with everything I've bought from you, until now. The strobes are eccentric in relation to each other, this affects the stroboscopic timing of each band. They are wobbling all over the disc, it's absolutely awful. The protractor on the reverse is solid and spot on, love the added refinement of .5 mm fine lines to the crosshatch pattern. The cartridge alignment is much easier to spot than on the 6 inch ruler version. Also a few other markings for the protractor are handy, including concentric rings showing different overhangs for differing table types. My Audio Technica lined up with the outermost one. The disc is thick, about as thick as an Edison Diamond disc, so it should be very stable for many years, but the silk screening on the strobe side is my biggest complaint, totally sloppy job.Update 01JAN20: Hudson is sending a replacement right away, no fuss! Thank you Hudson! 12JAN21-Replacement as bad as first. Not bothering Hudson about it again. The protractor is spot on, very nice, though.